However, we did not find significant differences in CD206+HLA-DR- and CD206-HLA-DR+ macrophages (which represented alveolar and interstitial macrophages, respectively) between COVID-19 and Non-COVID-19 lungs (Supplementary Fig. 1g–i), which represented alveolar and interstitial macrophages, respectively. Here, MRC1 is linked to COVID-19.